Use this A2-B1 ESL science reading passage to learn why clouds turn gray. It includes key vocabulary, reading comprehension questions, and answers for English learners.Reading LevelA2-B1Word Count218 wordsReading PassageClouds can look white, gray, or almost dark. The color depends on light and the thickness of the cloud.A cloud is made of many tiny water drops or ice crystals. These drops and c..